Question

Explain how compression steel in double reinforced beams increases ductility.

Answer 1

. From the analyses, it is also observed

that for the same concrete strength, the curvature ductility of

the RC member increases as the content of compression steel

is increased. The concrete strength has a significant effect on

the curvature ductility of RC beams. However, the rate of

increase of ductility for a doubly reinforced section is more

than that of a singly reinforced section and this pattern

increases as the concrete strength is increased. As the strength

of steel increases, it decreases the curvature ductility ratio and

this pattern is valid for both doubly reinforced and singly

reinforced beams but for the same strength of steel, the

ductility is higher for higher concrete strength.